Heavy duty construction, designed by UMF to meet the challenges and abuse of the commercial cleaning industry. Completely re-designed and ruggedized U-joint, with a solid stainless steel pin, is supported by the Integrated track (top side) designed to accommodate other components under development. Ribbed frame design molded in the underside of frame for strength. Drainage holes (top side) return fluid to the Flat Mop. Angled end caps for easy access to corners also anchor the Hook and Loop strips. The ONLY hardware with a Limited Lifetime Warranty on all components, that is, "you break it we replace it".